781055201 has 4 divisors (see below), whose sum is σ = 786227904. Its totient is φ = 775882500.

The previous prime is 781055179. The next prime is 781055203. The reversal of 781055201 is 102550187.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 781055201 - 2¹⁰ = 781054177 is a prime.

It is a super-3 number, since 3×781055201³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (781055203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2586125 + ... + 2586426.

It is an arithmetic number, because the mean of its divisors is an integer number (196556976).

Almost surely, 2^781055201 is an apocalyptic number.

It is an amenable number.

781055201 is a deficient number, since it is larger than the sum of its proper divisors (5172703).

781055201 is a wasteful number, since it uses less digits than its factorization.

781055201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5172702.

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 781055201 is about 27947.3648310534. The cubic root of 781055201 is about 920.9313194274.

The spelling of 781055201 in words is "seven hundred eighty-one million, fifty-five thousand, two hundred one".